David, Hi
It takes a bit of reading but is well worth the effort!
It also reinforces the complaints I made earlier this year about the sighting of diesel heater exhaust outlets on the new , higher-level, Broads Hire cruisers.
The one we were next to, at the New Inn, had it's exhaust directly pointing into our galley windows... When they started it up it literally choked us within a few minutes and we had to abandon the boat for a while. Fortunately this happened in mid morning; I dread to think of the consequences if it had been at night whilst we were asleep.......